Improvement in locks for handcuffs



J. `LTOWER, & H; W. KAHLKB.

Look for Handcuffs.

No. 2225751. Patented Dec. 16, 1879.`

"raras Arnim JOHN J. TOWER AND HENRY W. KAHLKE, OF BROOKLYN, NEW YORK,

ASSGNORS TO SAID JOHN J.'TOWER.

IMPROVEMENT IN LOCKS FOR HANDCUFFS.

Spccilication forming part of Letters Patent No. 222.751', datedDecember 16, 1879; application filed August 19, 1879.

To all whom 'it may concern:

Be it known that we, JOHN J. TOWER and` HENRY W. KAHLKE, of Brooklyn, inthe State of New York, have invented an Improvement in Locks forHandcus, te., of which the t'ollowing is a specification.

In Letters Patent No. 200,950, granted to us, the lock ot' the handcuffis made with a sliding bar, upon which are pivoted two on more swingingcatches.

Our present invention is for the purpose of locking the spring-catch sothat it cannot be forced back by an instrument introduced be,- tween thenotched segment and the radius-bar; for allowing the handeuft' to beslipped upon the person and instantly closed Without the use of a key;for all/owing the handcuif to be opened by the key, and preventing thewithdrawal of the key until the parts have been moved so as to be in aposition for instant use again.

- 1n the drawings, Figure l is an elevation of the handcuff and lock,the -plate of the lock being removed. Fig. 2 is a section at the line a:.cof Fig. l. Fig. 3 shows part of the radiusbar in section, andelevation of the lock, the tumblers being removed. Fig. 4 represents thebolt-detainingtumbler detached, and Fig. 5 shows the bolt detached. Fig.Gis a view similar to Fig. 3, but rthe guard-tumbler is not shown.

The radius-bar ct is jointed at b to the'end of the notched segment-barc, and the link d is applied at the joint, as usual. The segmentbar cpasses through the outer end of the radius-bar, and the notches in thesegmentbar care 0n the inner surface. Within the radius bar there is acavity for the parts of the lock, and the cap-plate f is secured byrivet-s in the ordinary manner. The springcatch h swings upon the studt, and it is moved toward the segment-bar by the spring le. l is asliding bolt, having a block, o, that can be moved in between the endsof the swinging catch h and the inner partot' the lock-case when thecatch h is in one of the notches ot1 the segmental bar. Hence the spring-catch cannot be forced back or drawn back until that block is removedfrom the said position shown in Fig. l.

The bolt Z has two talons on it, so that the key u turned upon the stud1 may act in the talon 2 and draw the bolt l and stud o to the positionshown in Fig. 6. The spring-catch l1. is now free to lnove either way.This is the normal position of the lock, and the position it assumeswhen the key has been once turned around and then removed from the lock.|lhe haudcutt can now be closed around the wrists, and the spring-catchwill yield as the segmentbar is forced through the radius-bar, and thesaid catch will prevent the lock being opened until some deviceisapplied to draw the springcatch back out of the notch ot' the segmentalbar c. This is accomplished by giving the key a partial second turn,which causes it to actin the talon 3 of the bolt and draw the samealong, and, by the block o acting on the tail 4 of the spring-catch,draw the same and the springl catch back out ot' the way of thesegmental bar.

It is now t0 be understood that any desired character ot' springs ortumblers may be employed to prevent end motion being given to the boltexcept by the key.

We have shown two tumblers, s s,witl1 springs and notches and a stud orfence, 6, upon the bolt, to hold the said bolt when inthe projectedposition, or when in the partially-retracted position that the partsassume when the handcufC is ready for use. When the key is applied todraw t-he bolt back and open the handcuff the spring of the catch wouldimmediately throw the bolt forward it' the key turned all, around, andhence clear the bolt. To prevent this the talon 4 may be made so as tostop the revolution of the key at the desired place 5' but we prefer anduse a guard-tumbler, t, made as seen in Fig. 4,. The incline S on thistumbler allows the said tumblerto swing until its heel 9 passes into thepath of the key and arrests its further movement. The key is nowblocked, and the parts of the lock do not act upon the segmentbar 5 butwhen the key is again turned forward the parts assume their normalposition, the guard-tumbler is raised out of the way of the key by thestud ofthe bolt running under the incline 8, the key can be removed, andthe handcuffs are ready for use. After they have been placed upon theprisoner so as to secure A him the key is applied to move the bolt andsecure the parts against any attempt to open 2. The combination, withthe notched seg- A ment-bar, of the spring-catch, the bolt l, block o,and guard-tumbler t, to prevent the Withdrawal of the key, substantiallyas set forth.

3. The combination of the notched segmental bar, the swingingradiusbar,. the swinging spring-catch 71., the bolt Z and its block o.the

guard-tumbler t, having the incline 8 and heel- 9, and the tumblers s s,and fence or stud 6, substantially as set forth.

4. The combination7 with the notched seg ment-bar c and the radius-bara, of a bolt moved by a key and acting to prevent the movement of' theradius-bar in either direction relat'bvely to the segmental bar7substantially as set forth.

Signed by us this 16th day of August, A.

JOHN J. TOWER. HENRY W. KAHLKE.

Vitnesses GEO. T. PINCKNEY, WILLIAM G. Mo'rr.

